Glenoid implant

ABSTRACT

A glenoid implant is provided and may include a body portion and a stem portion. The stem portion may extend from the body portion along a longitudinal axis. The body portion may include an articular side and a bone-engaging side opposite the articular side. At least a portion of the bone-engaging side may be disposed at a non-parallel angle relative to at least a peripheral edge of the articulation side.

CLAIM OF PRIORITY

This application is a Divisional of U.S. patent application Ser. No.14/459,935, filed on Aug. 14, 2014, which is incorporated herein byreference in its entirety.

FIELD

The present disclosure relates to a surgical implant, and moreparticularly to a glenoid implant having an angled bone-engaging portionor surface.

BACKGROUND

This section provides background information related to the presentdisclosure which is not necessarily prior art.

Surgical procedures for repairing or reconstructing a joint may requiresecurely fastening a surgical implant to a bone. For example, shoulderjoint procedures, such as reverse and/or anatomic shoulder arthroplasty,may require fixing a glenoid implant to a scapula to reproduce orreplicate a glenoid cavity on the scapula. In such procedures, it isdesirable to ensure the accurate placement and alignment of the implantrelative to the glenoid. To ensure the accurate placement and alignmentof the implant relative to the glenoid, often a total shoulderarthroplasty procedure will involve fixing a bone graft to the glenoidand/or reaming the glenoid in order to account for bone deficiencies anderosion of the glenoid. Fixing a bone graft to the glenoid and/orreaming the glenoid can help to return the glenoid surface to itsnatural position and profile, and thus ensure the accurate and secureplacement of the implant relative to the glenoid.

While known surgical procedures and surgical implants have proven to beacceptable for their intended purposes, a continuous need forimprovement in the relevant arts remains.

SUMMARY

This section provides a general summary of the disclosure, and is not acomprehensive disclosure of its full scope or all of its features.

According to one particular aspect, the present disclosure provides aglenoid implant. The glenoid implant may include a body portion and astem portion. The stem portion may extend from the body portion along alongitudinal axis. The body portion may include an articular side and abone-engaging side opposite the articular side. At least a portion ofthe bone-engaging side may be disposed at a non-parallel angle relativeto at least a peripheral edge of the articulation side.

In some configurations, the bone-engaging side may include asubstantially spherical bone-engaging surface.

In some configurations, the bone-engaging surface may include a firstportion and a second portion. The first portion may be disposed at afirst angle α1 relative to at least the peripheral edge of the articularside, and the second portion may be disposed at a second, differentangle α2 relative to at least the peripheral edge.

In some configurations, the first portion may extend about thelongitudinal axis by an angle θ.

In some configurations, the angle θ may be substantially equal to 180°.

In some configurations, the bone-engaging surface may include an arrayof teeth extending therefrom.

In some configurations, the articular side may be configured topartially receive a humeral head.

In some configurations, the articular side may be configured to receivea glenosphere.

In some configurations, the articular side may at least partially definea concave hemispherical shape.

In some configurations, the bone-engaging side may include a pluralityof blades. Each blade of the plurality of blades may include a proximalend, a distal end, an inner side and an outer side. The proximal end maybe adjacent to the bone-engaging side. The distal end may define awedge-shaped construct with at least a portion of the articular side.

In some configurations, the inner side and the stem portion may define aradially extending void therebetween.

In some configurations, the distal ends of the plurality of blades maycollectively define a substantially spherical profile.

In some configurations, each of the plurality of blades may define alength X extending between the proximal end and the distal end. A lengthX1 of a first blade may be less than a length X2 of a second blade.

In some configurations, the length L may vary between the inner side andthe outer side.

In some configurations, the bone-engaging side may include a pluralityof fixation members.

In some configurations, the fixation member may include a first annularfin and a second annular fin. The fixation member may define an annulargroove disposed between the first annular fin and the second annularfin.

In some configurations, the glenoid implant may include a plurality ofpeg assemblies. Each peg assembly may have a length L extending from aproximal end to a distal end. The proximal end may be coupled to thebody portion.

In some configurations, a length L1 of a first peg assembly may be lessthan a length L2 of a second peg assembly.

In some configurations, the articular side and the distal ends of theplurality of peg assemblies may define a wedge-shaped construct.

According to another particular aspect, the present disclosure providesa glenoid implant. The glenoid implant may include a stem portion and abody portion. The stem portion may have a longitudinal axis. The bodyportion may be carried at a distal end of the stem portion. The bodyportion may include an articular side, a bone-engaging side opposite thearticular side, and a peripheral sidewall extending between thearticular side and the bone-engaging side. The peripheral sidewall mayhave a depth parallel to the longitudinal axis. At least a portion ofthe peripheral sidewall may increase in depth in a directionperpendicular to the longitudinal axis.

According to yet another particular aspect, the present disclosureprovides a glenoid implant. The glenoid implant may include a bodyportion, a first insert and a second insert. The body portion mayinclude an articular side, a bone-engaging side opposite the articularside, a first aperture, and a second aperture. The first and secondapertures may extend between the articular and bone-engaging sides. Thesecond aperture may have an elongate shape. The first insert may becoupled to the body portion, and may include a first peg portiondisposed in the first aperture. The second insert may be rotatablycoupled to the body portion and may include a second peg portiondisposed in the second aperture.

Further areas of applicability will become apparent from the descriptionprovided herein. The description and specific examples in this summaryare intended for purposes of illustration only and are not intended tolimit the scope of the present disclosure.

DRAWINGS

The drawings described herein are for illustrative purposes only ofselected embodiments and not all possible implementations, and are notintended to limit the scope of the present disclosure.

FIG. 1 is a perspective view of a glenoid implant constructed inaccordance with the principles of the present disclosure;

FIG. 2A is a side view of the glenoid implant of FIG. 1;

FIG. 2B is a side view of another glenoid implant constructed inaccordance with the principles of the present disclosure;

FIG. 3A is a bottom view of the glenoid implant of FIG. 1;

FIG. 3B is a bottom view of the glenoid implant of FIG. 2B;

FIG. 4 is a cross-sectional view of the glenoid implant of FIG. 3A,taken through the line 4-4;

FIG. 5 is a side view of another glenoid implant constructed inaccordance with the principles of the present disclosure;

FIG. 6 is a perspective view of another glenoid implant constructed inaccordance with the principles of the present disclosure;

FIG. 7 is a bottom view of the glenoid implant of FIG. 6;

FIG. 8 is a cross-sectional view of the glenoid implant of FIG. 7, takenthrough the line 8-8;

FIG. 9A is a perspective view of another glenoid implant constructed inaccordance with the principles of the present disclosure, the glenoidimplant including a first and second peg assemblies;

FIG. 9B is a perspective view of the glenoid implant of FIG. 9Aincluding another peg assembly constructed in accordance with theprinciples of the present disclosure;

FIG. 10A is a cross-sectional view of the first peg assembly of FIG. 9A;

FIG. 10B is a cross-sectional view of the second peg assembly of FIG.9A;

FIG. 11 is a perspective view of another glenoid implant constructed inaccordance with the principles of the present disclosure, the glenoidimplant including an insert;

FIG. 12A is an exploded view of the glenoid implant of FIG. 11;

FIG. 12B is an exploded view of another glenoid implant constructed inaccordance with the principles of the present disclosure; and

FIG. 13 is a bottom view of another glenoid implant constructed inaccordance with the principles of the present disclosure.

Corresponding reference numerals indicate corresponding parts throughoutthe several views of the drawings.

DETAILED DESCRIPTION

Example embodiments will now be described more fully with reference tothe accompanying drawings.

With initial reference to FIGS. 1, 2A, 3A and 4, an implant constructedin accordance with the principles of the present disclosure isillustrated and generally identified at reference character 10.According to one exemplary use, the implant 10 may be a glenoid implantfor use in shoulder joint replacement. In such case, the glenoid implantcan replace or replicate an entire glenoid cavity (not shown) or aportion thereof for anatomic shoulder joint replacements. The glenoidimplant can also fill a defect in the glenoid cavity such as a void dueto severe wear. It will also be appreciated, however, that the presentteachings may be adapted to fix various implants to various bones.

The implant 10 may include a body portion 12 and a central fixationmember or stem 14. While the implant 10 is generally shown and describedherein as being monolithic, or an otherwise integrally formed construct,it will be appreciated that the body portion 12 and stem 14 may beformed as separate components and thereafter mechanically joined,press-fit, or threaded into an aperture formed in the body 12, such thatthe stem 14 extends from the body portion 12 along a longitudinal axis16.

The implant 10 can be formed from any biocompatible material, including,polymer, ceramic, metal or combinations thereof, and can be formed usingany suitable manufacturing technique, including machining, directcompression molding and/or additive manufacturing which enables formingmultiple implants in a single build and decreases manufacturing time.Once formed, the implant 10 can be further processed (e.g., polished,blasted, machining) as desired. For example, the implant 10 can bepolished for articulation with a humeral head made from polyethylene oranother suitable material. Alternatively, polyethylene can be moldedover or pressed onto the body 12 for articulation with a metal humeralhead.

The body 12 may include a peripheral surface 18, an articular surface orside 20, and a bone-engaging surface or side 22 opposite from thearticular side 20. As illustrated, in one configuration, the peripheralsurface 18 may define a generally circular or cylindrically shaped body12. It will also be appreciated that the peripheral surface 18 maydefine other shapes (e.g., rectangular, oval, pear-shaped, etc.) withinthe scope of the present disclosure. In this regard, the peripheralsurface 18 can be patient-specific and can match or replicate aperipheral surface of a glenoid cavity of a specific patient.

The articular side 20 of the implant 10 may be configured to partiallyreceive and nestingly engage or articulate with the head of a humerus(not shown). For example, the articular side 20 can include a concavehemispherically shaped surface that closely conforms as a mirror-imageof a complementary surface of the humeral head. In this regard, asillustrated in FIG. 2A, an outer peripheral edge 25 of the articularside 20 may define a plane that is substantially perpendicular to thelongitudinal axis 16. The humeral head can be part of the naturalhumerus of a specific patient, or the humeral head can be part of ahumeral implant. In other configurations, the articular side 20 of theimplant 10 may be configured to receive a glenosphere 23 (e.g., FIG.9A), including a stem portion 24 thereof.

The bone-engaging side 22 may be configured to nestingly engage with theglenoid cavity, or other bone surface. The bone-engaging side 22 mayinclude a surface 26. In some configurations, the surface 26 may beconvex, defining a substantially spherical profile. As illustrated inFIG. 2A, the surface 26 may be sloped such that the surface 26 furtherdefines an angle α with the outer peripheral edge 25 of the articularside 20. In certain embodiments, the angle α may be between zero degrees(0°) and thirty degrees (30°), such that the surface 26 and thearticular side 20 may define a substantially wedge-shaped construct. Inthis regard, a depth or distance X, extending in a directionsubstantially parallel to the longitudinal axis 16, between the surface26 and the outer peripheral edge 25 of the articular side 20 (i.e., adepth of the peripheral surface 18) may vary.

A plurality of apertures 36 may extend through the body 12, between thearticular side 20 and the bone-engaging side 22. As illustrated, in oneconfiguration the implant 10 may include four equally sized and spacedapertures 36. It will be appreciated, however, that the implant 10 mayinclude more or less than four apertures 36 within the scope of thepresent disclosure. The apertures 36 may extend through the body 12along axes 39, and may be sized and shaped to receive mechanicalfasteners (e.g., bone screws 38) for fixing the implant 10 to the bone.The axes 39 may form an angle β with the longitudinal axis 16. It willalso be appreciated that the implant 10 may be configured to be fixed tothe bone without using bone screws 38. In this regard, the implant 10may be configured such that the stem 14 can be press-fit into holesformed in the bone in order to fix the implant 10 to the bone. Inaddition, the implant 10 may be configured to receive bone cement on thestem 14 to fix the stem 14 within a corresponding bore or hole in thebone.

The stem 14 may include a proximal end or portion 40 and a distal end orportion 42. The proximal portion 40 may extend from the bone-engagingside 22 of the body 12 along the longitudinal axis 16. In this regard,the stem 14 may be centrally located relative to the bone-engaging side22. In one configuration, the proximal portion 40 may be substantiallycylindrical, defining a diameter D1. The proximal portion 40 may includea tapered or concavely radiused surface 44 adjacent the bone-engagingside 22, and a convexly radiused surface 46 adjacent the distal portion42. In one configuration, the distal portion 42 may be substantiallycylindrical, defining a diameter D2 that is less than the diameter D1.The distal portion 42 may extend from the proximal portion 40 along thelongitudinal axis 16, such that the distal portion 42 is concentricallyformed relative to the proximal portion 40.

An aperture 48 may extend through the stem 14 and the body 12 along thelongitudinal axis 16. The aperture 48 may be sized and shaped to receivean insert or removable fastener (not shown). The insert and/or aperipheral surface of the aperture 48 may be coated with a porousmaterial for improving the in-growth of bone into the aperture 48, andthus improve the stability and fixation of the implant 10 relative tothe bone by ensuring a secure connection between the stem 14 and acorresponding hole in the bone. Similarly, the bone-engaging surface 22may be coated with a porous material for improving the in-growth of boneinto the aperture 48 and/or the apertures 36.

With reference to FIGS. 2B and 3B, another configuration of an implantis shown and generally identified at reference character 10 a. Theimplant 10 a may be substantially similar to the implant 10, except asotherwise provided herein. Accordingly, like reference numerals are usedhereinafter and in the drawings to identify like components, while likereference numerals containing letter extensions (i.e., “a”) are used toidentify those components that have been modified.

A bone-engaging side 22 a of the implant 10 a may be at least partiallydefined by a first portion or surface 26 a and a second portion orsurface 28. As illustrated in FIG. 3B, the first and second surfaces 26a, 28 may extend between first and second ends 30, 32, such that thefirst surface 26 a extends about the longitudinal axis 16 from the firstend 30 to the second end 32, and the second surface 28 extends about thelongitudinal axis 16 from the second end 32 to the first end 30. In thisregard, the first surface 26 a may extend about the longitudinal axis 16by an angle θ. In one configuration, the angle θ may be substantiallyequal to one hundred eighty degrees (180°). It will be appreciated,however, that the angle θ may be greater or less than one hundred eightydegrees (180°) within the scope of the present disclosure. As will beexplained in more detail below, the angles θ and α may allow the surgeonto uniquely customize the implant 10 a for a particular patient.

In some configurations, the first surface 26 a may be convex, defining asubstantially spherical profile. The first surface 26 a may furtherdefine the angle α with the outer peripheral edge 25 of the articularside 20, such that the first surface 26 a and the articular side 20define a substantially wedge-shaped construct. The second surface 28 maybe substantially planar, or slightly convex. In this regard, the secondsurface 28 may include an outer peripheral edge 34 that is substantiallyparallel to the outer peripheral edge 25 of the articular side 20 (i.e.,disposed at an angle of approximately zero degrees (0°) relative to theouter peripheral edge 25), and substantially perpendicular to thelongitudinal axis 16.

An example method of repairing a bone, such as a glenoid cavity of ascapula (not shown), will now be described. First, a surgeon may drillor otherwise form at least one hole in the glenoid cavity. A first holecan be sized for receiving the stem 14. A plurality of second holes canbe sized for receiving the bone screws 38. A surface of the scapula canbe reamed, or otherwise resurfaced, to remove an eroded portion of thebone. The implant 10 may be placed within the glenoid cavity such thatthe surface 26 engages the bone. The implant 10 may be rotated about thelongitudinal axis 16, before or after the surface 26 is engaged with thebone, such that the angle α allows the outer peripheral edge 25 of thearticular side 20 to be substantially aligned, or otherwise flush with,the surface of the bone. In this position, the apertures 36 may bealigned with the second holes.

It will be appreciated that the configuration of the implant 10,including the configuration of the surfaces 26, 26 a, and 28, can allowfor the use of a single implant 10, 10 a in multiple positions andconfigurations relative to the bone, while also minimizing the need forexcessive reaming and/or the use of bone grafts to account for erosionin an implant-engaging surface of the bone.

With reference to FIG. 5, another implant constructed in accordance withthe present teachings is illustrated and generally identified atreference character 10 b. The structure and function of the implant 10 bmay be similar or identical to the structure and function of the implant10 described above, apart from any exceptions described below and/orshown in the figures. Accordingly, similar features will not bedescribed again in detail. Like reference numerals are used hereinafterand in the drawings to identify like components, while like referencenumerals containing letter extensions (i.e., “b”) are used to identifythose components that have been modified.

The implant 10 b may be used in an anatomic shoulder arthroplastyprocedure. Accordingly, the bone-engaging side 22 b of the implant 10 bmay include a plurality of protrusions or teeth 50 and a plurality ofperipheral fixation members or pegs 52 extending therefrom. The teeth 50may be shaped as pyramidal frustums. In one configuration, the teeth 50may be shaped as truncated square pyramids. The teeth 50 may be arrangedin a grid or array of orthogonally disposed rows, helping bone cement toflow or otherwise disburse between the bone and the bone-engaging side.

The peripheral pegs 52 may include a substantially cylindrical body 54extending between a proximal end 56 and a distal end 58 and having adiameter D3. The proximal end 56 may be adjacent to the bone-engagingside 22 b of the body 54. The peripheral pegs 52 may also include anannular groove 60 formed in a peripheral surface of the body 54. Asillustrated, in one configuration, each peripheral peg 52 includes twoannular grooves 60 defining three annular fin portions 62 of the body54. It will be appreciated, however, that each peg 52 may include moreor less than three annular grooves 60 and fin portions 62 within thescope of the present disclosure. In this regard, a further discussion ofthe peripheral pegs 52, including various configurations and functionsthereof, may be found in commonly owned U.S. patent application Ser. No.14/226,051 filed Mar. 26, 2014 and entitled “Press-Fit Glenoid WithPeripheral Compression Pegs”, which is hereby incorporated by referencein its entirety.

An example method of repairing a scapula with the implant 10 b mayinclude drilling or otherwise forming a plurality of holes in thescapula. A first hole can be sized for receiving the stem 14. Aplurality of second holes can be sized for receiving the peripheral pegs52. A surface of the scapula can be reamed, or otherwise resurfaced, toremove an eroded portion of the bone. The implant 10 b may be placedwithin the glenoid cavity such that the first surface 26 b of thebone-engaging side 22 b is substantially aligned with the reamed orresurfaced portion of the bone, and the peripheral pegs 52 aresubstantially aligned with the plurality of second holes. In thisregard, the implant 10 b may be rotated about the longitudinal axis 16,before the first surface 26 b is engaged with the bone, such that theangle α formed by the first surface 26 b allows the outer peripheraledge 25 b of the articular side 20 b to be substantially aligned, orotherwise flush with, the surface of the bone.

A force may be applied to the implant 10 b such that the annular finportions 62 engage the second holes of the scapula in a press-fitconfiguration. In this regard, it will be appreciated that the finportions 62 may deform or otherwise flex to ensure stability and asecure fit between the implant 10 b and the scapula. Bone cement may beinserted into the second holes in the scapula. The bone cement may flowinto the annular grooves 60 to ensure that the implant 10 b isadequately secured to the scapula.

With reference to FIGS. 6 through 8, another implant in accordance withthe present teachings is illustrated and generally identified atreference character 10 c. The structure and function of the implant 10 cmay be similar or identical to the structure and function of the implant10 described above, apart from any exceptions described below and/orshown in the figures. Accordingly, similar features will not bedescribed again in detail. Like reference numerals are used hereinafterand in the drawings to identify like components, while like referencenumerals containing letter extensions (i.e., “c”) are used to identifythose components that have been modified.

The bone-engaging side 22 c of the implant 10 c may include a surface 26c. A plurality of bone-engaging blades or projections 70, separated byvoids 71, may extend from the surface 26 c. The projections 70 mayextend from and between a proximal end 72 and a distal end 74 in adirection substantially parallel to the longitudinal axis 16. Theprojections 70 may further extend from and between a radially inner side76 and a radially outer side 78 in a direction substantiallyperpendicular to the longitudinal axis 16. In this regard, the proximalend 72 may be adjacent and integral to the surface 26 c, while the outerside 78 may be aligned with the peripheral surface 18 c. As illustratedin FIG. 7, the inner side 76 and the stem 14 may define a radiallyextending void or gap 80 therebetween.

The distal end 74 of the projection 70 may define the angle α with theouter peripheral edge 25 of the articular side 20, such that theperipheral edge 25 and the distal ends 74 of the projections 70 define asubstantially wedge-shaped construct, as illustrated in FIG. 8. Inaddition, as illustrated in FIGS. 6 and 8, a distance Xc between theproximal and distal ends 72, 74 may vary between consecutive projections70, such that the distal ends 74 of consecutive projections 70 maydefine a convex profile. In some configurations, the distance Xc mayalso vary between the inner and outer sides 76, 78, such that the distalends 74 define a substantially spherical profile.

As illustrated in FIG. 7, the plurality of projections 70 may extendabout the longitudinal axis by an angle θc. In one configuration, theangle θc may be substantially equal to one hundred fifty degrees (150°).It will be appreciated, however, that the angle θ1 c may be greater orless than one hundred fifty degrees (150°) within the scope of thepresent disclosure. It will also be appreciated that, while theprojections 70 are illustrated as having a blade-like construct, theprojections 70 may have other configurations (e.g., spikes, stems,detents, etc.) within the scope of the present disclosure.

An example method of repairing a scapula with the implant 10 c mayinclude drilling or otherwise forming at least one hole in the scapula.A first hole can be sized for receiving the stem 14. A plurality ofsecond holes can be sized for receiving the fasteners 38. A surface ofthe scapula can be reamed, or otherwise resurfaced, to remove an erodedportion of the bone. The implant 10 c may be placed within the glenoidcavity such that the projections 70 are substantially aligned with thereamed or resurfaced portion of the bone. In this regard, the implant 10c may be rotated about the longitudinal axis 16 before the bone-engagingside 22 c is engaged with the bone, such that the angle α formed byprojections 70 allows the outer peripheral edge 25 of the articular side20 to be substantially aligned, or otherwise flush with, the surface ofthe bone. Bone grafts may be placed in the voids 71 and the gap 80 tohelp ensure a secure fit between the implant 10 c and the scapula. Inaddition, the surface 26 c may include a porous coating to help ensure asecure fit between the implant 10 c and the scapula. Thereafter, a forcemay be applied to the implant 10 c in a direction substantially parallelto the axis 16 such that the projections 70 engage the scapula.

With reference to FIG. 9A, another in accordance with the presentteachings is illustrated and generally identified at reference character10 d. The structure and function of the implant 10 d may be similar oridentical to the structure and function of the implant 10 describedabove, apart from any exceptions described below and/or shown in thefigures. Accordingly, similar features will not be described again indetail. Like reference numerals are used hereinafter and in the drawingsto identify like components, while like reference numerals containingletter extensions (i.e., “d”) are used to identify those components thathave been modified.

A second plurality of apertures 90 may extend through the body 12 d,between the articular side 20 d and the bone-engaging side 22 d. Asillustrated, in one configuration the implant 10 d may include twoequally sized and spaced apertures 90. It will be appreciated, however,that the implant 10 may include more or less than two apertures 90within the scope of the present disclosure. Each aperture 90 may belocated between adjacent apertures 36. In some configurations, theapertures 90 may extend through the body 12 d in a directionsubstantially parallel to the longitudinal axis 16 and substantiallyperpendicular to the outer peripheral edge 25 of the articular side 20d. It will also be appreciated that the apertures 90 may extend throughthe body 12 d at a non-parallel angle relative to the longitudinal axis16 within the scope of the present disclosure.

The aperture 90 and/or the aperture 36 may be sized and shaped toreceive a first peg assembly 92 and/or a second peg assembly 94. Asillustrated in FIG. 10A, the first peg assembly 92 may include a pegmember 96 and a housing 98. The peg member 96 may include a head portion100 and a stem portion 102. The head portion 100 may include a threadedportion 104, such that the head portion 100 can be threadably receivedwithin the aperture 36 and/or the aperture 90. The stem portion 102 mayinclude a substantially cylindrical construct. As illustrated in FIG.9A, in one configuration a stem portion 102 a may include a threadedportion 106 for threadably engaging the glenoid or other bone.

With reference to FIG. 10A, in one configuration the housing 98 maydefine a substantially cylindrical construct, including a first end 108and a second end 110. In some configurations, the second end 110 may bea closed end. In this regard, the second end 110 may be rounded, orotherwise radiused, to minimize and disburse the transmission of forcesand stresses between the housing 98 and the bone, as will be explainedin more detail below. As illustrated in FIG. 9B, in other configurationsa second end 110 a of a housing 98 a may be an open end. The housings98, 98 a may define a length L1 extending from the first end 108 to thesecond end 110, 110 a, respectively. A cannulation 114 may extendbetween the first end 108 and the second end 110, 110 a. As will beexplained in more detail below, in an assembled configuration, the stemportion 102 of the peg member 92 may be disposed within the cannulation114, such that the head portion 100 abuts the first end 108 of thehousing 98.

As illustrated in FIG. 10B, the second peg assembly 94 may include a pegmember 118 and the housing 98 or 98 a. The peg member 118 may include ahead portion 122, a stem portion 124 and a flange portion 126. Theflange portion 126 may extend radially outward from the stem portion124. In an assembled configuration, the stem portion 124 may be disposedwithin the housing 98 or 98 a such that the flange portion 126 abuts thefirst end 108 of the housing.

As illustrated in FIGS. 9A and 9B, the length L1 of the housings 98, 98Amay vary. Accordingly, the implant 10 d may include any number of firstand/or second peg assemblies 92, 94, each having a different length L1,such that in an assembled configuration a distance between the articularside 20 d and the second ends 110 of the housings 98, 98 a varies. Inthis regard, the the second ends 110 and the articular side 20 d and/orthe peripheral edge 25 may define a wedge-shaped construct. The headportions 100, 122 may be received by, or otherwise secured within, theaperture 90 or the aperture 36.

An example method of repairing a scapula with the implant 10 d mayinclude drilling or otherwise forming a plurality of holes in thescapula. A first hole can be sized for receiving the stem 14. Aplurality of second holes can be sized for receiving the housings 98and/or 98 a. In this regard, based on the type and length L1 of thehousing 98, 98 a being used, the surgeon can drill the second holes to apredetermined length. The housings 98, 98 a may be placed within theplurality of second holes. A diameter of the housings 98, 98 a may beslightly greater than a diameter of the second holes, such that thehousings 98, 98 a interfere with, or are otherwise press-fit into, thesecond holes.

The implant 10 d may be placed within the glenoid cavity such that thebone-engaging side 22 d engages the scapula. The peg members 96, 118 maybe placed within the apertures 36, 90 and the cannulation 114 to securethe implant 10 d to the glenoid. In this regard, a diameter of the stemportion 102, 124 may be slightly greater than a diameter of thecannulation 114, such that the stem portions 102, 124 interfere with, orare otherwise press-fit into, the cannulation 114. As illustrated inFIG. 9B, in some configurations, the stem portions 102 may extendthrough the second end 110 of the housing 98 such that the stem portion102 can extend into the glenoid to further secure the implant 10 drelative to the glenoid. Bone grafts may be placed in gaps 130 betweenthe body 12 d and the peg assemblies 92, 94 to help ensure a secure fitbetween the implant 10 d and the scapula.

With reference to FIGS. 11 through 128, another implant in accordancewith the present teachings is illustrated and generally identified atreference character 10 e. The structure and function of the implant 10 emay be similar or identical to the structure and function of the implant10 d described above, apart from any exceptions described below and/orshown in the figures. Accordingly, similar features will not bedescribed again in detail. Like reference numerals are used hereinafterand in the drawings to identify like components, while like referencenumerals containing letter extensions (i.e., “e”) are used to identifythose components that have been modified.

The implant 10 e may include a plurality of apertures 90 located betweenadjacent apertures 36. In some configurations, the apertures 90 mayinclude a substantially circular cross sectional area (FIGS. 11 and12A). It will be appreciated, however, that the apertures 90 may includeother cross-sectional shapes within the scope of the present disclosure.For example, as illustrated in FIG. 12B, in some configurations, theapertures 90 f may include an elongate or kidney-shaped cross section.

As illustrated, in one configuration, the implant 10 e may include twoapertures 90 located between each pair of adjacent apertures 36. In thisregard, the apertures 90 may substantially define a circular pattern.The apertures 90, 90 f may be tapered (e.g., a Morse taper) between thearticular side 20 e and the bone-engaging side 22 e, such that across-sectional area of the aperture increases from the articular sideto the bone-engaging side.

The implant 10 e may further include a first insert 134 and a secondinsert 136. The first insert 134 may include an implant engaging surface138, a bone-engaging surface 140, a radially inner surface 142, and aradially outer surface 144. The implant engaging surface 138 and thebone-engaging surface 140 define a distance Xe extending therebetween.In some configurations, the distance Xe may vary between the implantengaging surface 138 and the bone-engaging surface 140, such that thefirst insert 134 substantially defines a wedge-shaped construct (FIG.12A). In other configurations, the distance Xe may be constant (FIG.12B). Accordingly, in some configurations, a first insert 134 f maydefine a substantially rectangular cross section.

The implant engaging surface 138 may include at least one peg 112. Insome configurations, the implant engaging surface 138 may include twopegs 112. The peg 112 may be tapered (e.g., a Morse taper) such that across-sectional area of the peg 112 corresponds to the cross-sectionalarea of the aperture 90 to allow for a press-fit engagement between thepeg 112 and the aperture 90. In this regard, in some configurations, thepeg 112 may include a substantially circular cross sectional area (FIGS.11 and 12A). It will be appreciated, however, that the peg 112 mayinclude other cross-sectional shapes to correspond with the shape of theaperture 90. For example, as illustrated in FIG. 12B, in someconfigurations, the peg 112 f may include an elongate or kidney-shapedcross section to correspond with the shape of the aperture 90 f.

The radially inner surface 142 may extend arcuately from and betweenfirst and second ends 148, 150 of the first insert 134. In this regard,the radially inner surface 142 may be concave. The radially outersurface 144 may oppose the radially inner surface 142 and extendarcuately from and between the first and second ends 148, 150. In thisregard, the radially outer surface 144 may be convex.

The second insert 136 may be similar or identical to the structure andfunction of the first insert 134 described above, apart from anyexceptions described below and/or shown in the figures. Accordingly,similar features will not be described again in detail. Like referencenumerals are used hereinafter and in the drawings to identify likecomponents. The second insert 136 may include an aperture 152 extendingbetween the implant engaging surface 138 and the bone-engaging surface140. In some configurations, the aperture 152 may be disposed betweenconsecutive pegs 112.

As illustrated in FIGS. 12A and 128, in an assembled configuration, thebody 12 and the first and second inserts 134, 136 define a substantiallywedge-shaped implant 10 e. The pegs 112, 112 f may be disposed in theapertures 90, 90 f such that the peripheral surface 18 e of the body 12e is substantially aligned or flush with the radially outer surface 144of the first and second inserts 134, 136. In this regard, the first end148 of the first implant 134, 134 f, and the second end 150 of thesecond implant 136, 136 f can define an angle 9 g extending about theaxis 16.

As illustrated in FIG. 13, in some configurations of an implant 10 g,the pegs 112 of the first and/or second insert 134, 136 can be insertedinto the apertures 90 f of the body 12 f. Similarly, the insert 134 fcan include the pegs 112. Inserting the substantially cylindrical pegs112 into the elongate or substantially kidney-shaped apertures 90 f, canallow the first inserts 134, 134 f and/or the second inserts 136, 136 fto rotate relative to the body 12 f, such that the angle θg isadjustable. In this regard, the pegs 112 may be slidably, or otherwisemovably disposed in the apertures 90 f. Rotating the first insert 134,134 f and/or the second insert 136, 136 f relative to the body 12 f canallow the implant 10 g, including the inserts 134, 134 f, 136, 136 f, tocover a larger deficiency or eroded portion of the bone.

It will be appreciated that the augmented or wedge-shaped construct ofthe implants 10, 10 a, 10 b, 10 c, 10 d, 10 e, 10 f and 10 g can improvethe surgical implantation of the implants by accounting for erosion andwear patterns in the bone. Accounting for erosion and wear patterns inthe bone can help to minimize or eliminate the need for bone grafts andexcessive reaming of the bone, thereby reducing the amount of surgicaltime, while ensuring the accurate and secure placement of the implantrelative to the bone.

The foregoing description of the embodiments has been provided forpurposes of illustration and description. It is not intended to beexhaustive or to limit the disclosure. Individual elements or featuresof a particular embodiment are generally not limited to that particularembodiment, but, where applicable, are interchangeable and can be usedin a selected embodiment, even if not specifically shown or described.The same may also be varied in many ways. Such variations are not to beregarded as a departure from the disclosure, and all such modificationsare intended to be included within the scope of the disclosure.

Example embodiments are provided so that this disclosure will bethorough, and will fully convey the scope to those who are skilled inthe art. Numerous specific details are set forth such as examples ofspecific components, devices, and methods, to provide a thoroughunderstanding of embodiments of the present disclosure. It will beapparent to those skilled in the art that specific details need not beemployed, that example embodiments may be embodied in many differentforms and that neither should be construed to limit the scope of thedisclosure. In some example embodiments, well-known processes,well-known device structures, and well-known technologies are notdescribed in detail.

The terminology used herein is for the purpose of describing particularexample embodiments only and is not intended to be limiting. As usedherein, the singular forms “a,” “an,” and “the” may be intended toinclude the plural forms as well, unless the context clearly indicatesotherwise. The terms “comprises,” “comprising,” “including,” and“having,” are inclusive and therefore specify the presence of statedfeatures, integers, steps, operations, elements, and/or components, butdo not preclude the presence or addition of one or more other features,integers, steps, operations, elements, components, and/or groupsthereof. The method steps, processes, and operations described hereinare not to be construed as necessarily requiring their performance inthe particular order discussed or illustrated, unless specificallyidentified as an order of performance. It is also to be understood thatadditional or alternative steps may be employed.

When an element or layer is referred to as being “on,” “engaged to,”“connected to,” or “coupled to” another element or layer, it may bedirectly on, engaged, connected or coupled to the other element orlayer, or intervening elements or layers may be present. In contrast,when an element is referred to as being “directly on,” “directly engagedto,” “directly connected to,” or “directly coupled to” another elementor layer, there may be no intervening elements or layers present. Otherwords used to describe the relationship between elements should beinterpreted in a like fashion (e.g., “between” versus “directlybetween,” “adjacent” versus “directly adjacent,” etc.). As used herein,the term “and/or” includes any and all combinations of one or more ofthe associated listed items.

Although the terms first, second, third, etc. may be used herein todescribe various elements, components, regions, layers and/or sections,these elements, components, regions, layers and/or sections should notbe limited by these terms. These terms may be only used to distinguishone element, component, region, layer or section from another region,layer or section. Terms such as “first,” “second,” and other numericalterms when used herein do not imply a sequence or order unless clearlyindicated by the context. Thus, a first element, component, region,layer or section discussed below could be termed a second element,component, region, layer or section without departing from the teachingsof the example embodiments.

Spatially relative terms, such as “inner,” “outer,” “beneath,” “below,”“lower,” “above,” “upper,” and the like, may be used herein for ease ofdescription to describe one element or feature's relationship to anotherelement(s) or feature(s) as illustrated in the figures. Spatiallyrelative terms may be intended to encompass different orientations ofthe device in use or operation in addition to the orientation depictedin the figures. For example, if the device in the figures is turnedover, elements described as “below” or “beneath” other elements orfeatures would then be oriented “above” the other elements or features.Thus, the example term “below” can encompass both an orientation ofabove and below. The device may be otherwise oriented (rotated 90degrees or at other orientations) and the spatially relative descriptorsused herein interpreted accordingly.

The terms “approximately,” “generally,” “about,” and “substantially,” asused to describe particular angles, shall be understood to encompass thestated angle and a range of one to two degrees (1°-2°).

1. A glenoid implant, comprising: a body portion that includes anarticular side and a concave bone-engaging side opposite the articularside; a stem portion extending from the bone-engaging side of the bodyportion along a longitudinal axis; and a plurality of peripheral pegsconfigured to extend from the bone-engaging side of the body portion. 2.The glenoid implant of claim 1, wherein each peripheral peg includes acylindrical body that is configured to extend from a proximal end,adjacent to the bone-engaging side of the body portion, to a distal end,away from the bone-engaging side of the body portion.
 3. The glenoidimplant of claim 2, wherein each peripheral peg includes at least oneannular groove formed in a peripheral surface of the cylindrical body ofthe peripheral peg.
 4. The glenoid implant of claim 3, wherein: aproximal portion of the cylindrical body has a body diameter; and theannular groove forms a waist that has a waist diameter around thecylindrical body, the waist diameter being less than the body diameter.5. The glenoid implant of claim 2, wherein each peripheral peg includesa plurality of annular grooves formed in a peripheral surface of thecylindrical body of the peripheral peg.
 6. The glenoid implant of claim5, wherein in a cross-section taken parallel to the peripheral peg, eachannular groove has a cross-section that is concave and smoothly varyingfrom a proximal end of the annular groove to a distal end of the annulargroove.
 7. The glenoid implant of claim 5, wherein each peripheral pegincludes an annular fin portion formed in the peripheral surface of thecylindrical body of the peripheral peg and positioned adjacent one ofthe annular grooves.
 8. The glenoid implant of claim 7, wherein: aproximal portion of the cylindrical body has a body diameter; and theannular fin portion has a fin diameter around the cylindrical body, thefin portion diameter being greater than the body diameter.
 9. Theglenoid implant of claim 8, wherein in a cross-section takenperpendicular to the peripheral peg, the annular fin portion has acircular cross-section having a fin diameter that remains constant froma proximal end of the annular fin portion to a distal end of the annularfin portion.
 10. The glenoid implant of claim 8, wherein the annular finportion is shaped to deform or flex upon forming a press-fit connection.11. The glenoid implant of claim 5, wherein each peripheral peg includesa plurality of annular fin portions formed in the peripheral surface ofthe cylindrical body of the peripheral peg and positioned such that eachadjacent pair of annular fin portions surround an annular groove. 12.The glenoid implant of claim 5, wherein each peripheral peg includes:three annular fin portions formed in the peripheral surface of thecylindrical body of the peripheral peg; and two annular grooves formedin the peripheral surface of the cylindrical body of the peripheral pegand interspersed with the three annular fin portions.
 13. The glenoidimplant of claim 1, further comprising: a plurality of teeth extendingfrom the bone-engaging side of the body portion.
 14. The glenoid implantof claim 13, wherein the teeth are formed as indentations on a concavebase surface of the concave bone-engaging side.
 15. The glenoid implantof claim 14, wherein: the concave base surface is spaced farthest awayfrom an outer peripheral edge of the articular side at first location;the first location defines a first axis extending from the firstlocation through the longitudinal axis such that the first axis isorthogonal to the longitudinal axis; the first location further definesa second axis extending through an intersection of the first axis andthe longitudinal axis such that the second axis is orthogonal to boththe first axis and the longitudinal axis; and the indentations aredeepest along the second axis, with decreasing depth away from thesecond axis.
 16. A method for repairing a shoulder joint using a glenoidimplant, the method comprising: drilling a first hole in a scapula ofthe shoulder joint, the first hole being sized to receive a stem of theglenoid implant; drilling a plurality of second holes in the scapula,each of the second holes being sized to receive a respective peripheralpeg of the glenoid implant; shaping a surface of the scapula to removean eroded portion of bone; placing the glenoid implant within a glenoidcavity of the shoulder joint, such that a concave base surface of abone-engaging side of the glenoid implant aligns with the shaped surfaceof the scapula and the peripheral pegs of the glenoid implant align withthe plurality of second holes in the scapula; forcing the glenoidimplant against the scapula such that annular fins on the peripheralpegs of the glenoid implant form a press-fit against the second holes inthe scapula; inserting bone cement into the second holes in the scapula;and flowing the bone cement into annular grooves formed between adjacentannular fins on the peripheral pegs of the glenoid implant.
 17. Themethod of claim 16, further comprising, before placing the glenoidimplant: rotating the glenoid implant about a longitudinal axis of thestem of the glenoid implant to align an outer peripheral edge of anarticular side of the glenoid implant with a surface of the bone.
 18. Aglenoid implant, comprising: a body portion that includes an articularside and a concave bone-engaging side opposite the articular side; astem portion extending from the bone-engaging side of the body portionalong a longitudinal axis; and a plurality of peripheral pegs configuredto extend from the bone-engaging side of the body portion, eachperipheral peg including: a cylindrical body that is configured toextend from a proximal end, adjacent to the bone-engaging side of thebody portion, to a distal end, away from the bone-engaging side of thebody portion, a proximal portion of the cylindrical body having a bodydiameter; an annular groove formed in a peripheral surface of thecylindrical body of the peripheral peg, the annular groove forming awaist that has a waist diameter around the cylindrical body, the waistdiameter being less than the body diameter; and an annular fin portionformed in the peripheral surface of the cylindrical body of theperipheral peg and positioned adjacent one of the annular grooves, theannular fin portion having a fin diameter around the cylindrical body,the fin diameter being greater than the body diameter.
 19. The glenoidimplant of claim 18, wherein: in a cross-section taken parallel to theperipheral peg, the annular groove has a cross-section that is concaveand smoothly varying from a proximal end of the annular groove to adistal end of the annular groove, and in a cross-section takenperpendicular to the peripheral peg, the annular fin portion has acircular cross-section having a fin diameter that remains constant froma proximal end of the annular fin portion to a distal end of the annularfin portion, the fin diameter being greater than the body diameter. 20.The glenoid implant of claim 18, wherein the annular fin portion isshaped to deform or flex upon forming a press-fit connection.